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Typical Scaled Web App Stack

Web App Stack w/ Varnish

Zend Framework 2

Modular

Secure

Extensible

Community

High Performing

Enterprise Ready

Varnish Cache

Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy.
You install it in front of any server that speaks HTTP and configure it to cache the contents.
Varnish Cache is really, really fast.
It typically speeds up delivery with a factor of 300 - 1000x, depending on your architecture.